Equine Herpes Myeloencephalopathy (EHM) Updates:

No Current Quarantines

Orange County Quarantine RELEASED

May 15, 2018: All quarantines have been released on the Orange County Premises.

May 13, 2018: No New Cases. Today, CDFA released the barn of exposed horses from quarantine. Three horses remain under quarantine in onsite isolation stabling. These horses have had one negative test and await second negative test required for release from isolation. The horses will be sampled on Monday May 14, 2018 and if test negative they will be released from quarantine. CDFA continues onsite monitoring of the situation.

May 11, 2018: NO New Cases. CDFA continues onsite monitoring of the situation.

May 10, 2018:No New Cases. CDFA continues onsite monitoring of the situation.

May 10, 2018: No New Cases. CDFA continues onsite monitoring of the situation.

May 9, 2018: No New Cases. Enhanced biosecurity measures and twice daily temperature recording for all exposed horses in the quarantine barn continues. No fevers or clinical signs have been reported in the last 10 days. If no additional cases are identified, the barn will be released from quarantine on Sunday May 13, 2018.  However, positive horses in isolation will remain under quarantine until they have two negative tests. At this time, all positive horses have had at least one negative test and isolation quarantine release is anticipated early next week.

May 8, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

May 7, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

May 6, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

May 5, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

May 4, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

May 3, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

May 2, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

May 1, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

April 30, 2018: NO NEW CASES. CDFA continues onsite monitoring of the situation.

April 29, 2018: One New Confirmed EHM Case. A 9 year old mare from the quarantined barn at the Orange County Facility, displaying neurological signs has tested positive for Equine Herpesvirus-1. Based on clinical signs and the detection of the EHV-1 virus, the horse has been classified as a case of Equine Herpesvirus Myeloencephalopathy. This mare has been placed in onsite isolation stabling. To date, there have been seven (7) confirmed febrile cases of EHV-1 and three confirmed cases of EHM. CDFA continues onsite monitoring of the situation.

April 28, 2018: No New Cases: CDFA staff continues onsite monitoring of the situation.  

April 27, 2018: One new confirmed EHM Case. A 24 year old mare from the quarantined barn at the Orange County Facility, displaying neurological signs has tested positve for Equine Herpesvirus-1. Based on clinical signs and the detection of EHV-1 virus, the horse has been classified as a case of Equine Herpesvirus Myeloencephalopathy (EHM). The mare has been moved to onsite isolation stabling. To date, there have been seven confirmed febrile cases of EHV-1 ad two confirmed cases of EHM. CDFA staff continues onsite monitoring of the situation.  

April 26, 2018: Two new confirmed cases.  Two horses from the quarantined barn at the Orange County Facility, displaying fevers, have been confirmed positive for the Equine Herpesvirus-1 (EHV-1). The first positive horse displayed a fever on Monday and was placed in onsite isolation stabling. The second positive horse initially tested negative over the weekend and was moved off site for isolation and quarantine. Enhanced biosecurity measures and twice daily temperature recording for all exposed horses in the quarantine barn continues. To date, there have been seven confirmed febrile cases of EHV-1 and the one index case of Equine Herpesvirus Myeloencephalopathy (EHM). Release of positive horses from quarantine isolation requires two negative tests seven days apart. CDFA staff continues onsite monitoring of the situation.

 April 25, 2018: NO NEW CASES. Enhanced biosecurity measures, including twice daily recording of temperatures of exposed horses, continue in the quarantine barn at the Orange County facility. There have been no fevers reported in the quarantine barn for the past two days. CDFA staff remains onsite to monitor the situation. 

 April 24, 2018: One new confirmed case.  A febrile horse from the quarantined barn at the Orange County facility which initially tested negative has been resampled and confirmed positive for the Equine Herpesvirus-1 (EHV-1). This horse has been placed in isolation on the premises. To date, there have been five confirmed febrile cases of EHV-1 and the one index case of Equine Herpesvirus Myeloencephalopathy (EHM) which remains isolated and quarantined off site. CDFA staff continues to be onsite monitoring the situation.

April 23, 2018: Two new confirmed cases.  Two horses from the quarantined barn at the Orange County Facility, displaying fevers over the weekend, have been confirmed positive for the Equine Herpesvirus-1 (EHV-1). Both horses are in isolation stabling onsite. An additional horse from the quarantine barn displaying a fever over the weekend has tested negative for EHV-1 and will be re-sampled to confirm negative status. This horse has been moved off site for isolation and quarantine. Enhanced biosecurity measures and twice daily temperature recording for all exposed horses in the quarantine barn continues. Additionally, the recommendation is for all horses on the premises have temperatures taken twice daily. Any horse on the premises with a fever will be tested for EHV-1.  A horse from a non-quarantined barn at the facility displaying a fever over the weekend was sampled and tested negative for EHV-1. At this time, there is no evidence of virus spread beyond the quarantined barn on the premises.  To date, there have been four confirmed febrile cases of EHV-1 all of which are in isolation stabling onsite and the one index case of Equine Herpesvirus Myeloencephalopathy (EHM) which is isolated and quarantined off site. CDFA staff continues to be onsite monitoring the situation.

April 22, 2018:  No new cases. Enhanced biosecurity measures, including twice daily recording of temperatures of exposed horses, continue in the quarantine barn at the Orange County facility. CDFA staff remains onsite to monitor the situation. 

April 21, 2018:   No new cases. A horse in the quarantine barn at the Orange County facility displaying a fever on April 20, 2019 tested negative for Equine Herpesvirus-1. The horse will be retested to confirm negative status. Two additional horses in the quarantined barn displayed fevers the evening of April 21, 2018. These horses have been isolated and the samples collected will be tested Monday morning at the California Animal Health and Food Safety Laboratory. To date, there have been a total of three confirmed cases (two febrile EHV-1 cases in isolation at the facility and the index Equine Herpesvirus Myeloencephalopathy case quarantined at an offsite isolation facility). CDFA continues to be onsite to monitor the situation.

April 20, 2018: No new cases. There have been no fevers reported in the quarantine barn at the Orange County facility. The positive horse in isolation which was febrile on April 8, 2018 was sampled yesterday and the nasal swab has been confirmed negative for EHV-1. This horse will be released from isolation on a second negative nasal swab.  CDFA staff continues to be onsite to monitor the situation.

April 19, 2018:   No new cases. A horse in the quarantine barn at the Orange County facility displaying a fever on April 18, 2019 tested negative for Equine Herpesvirus-1. The horse will be retested to confirm negative status. There have been no fevers reported today. Exposed horses under quarantine continue to be monitored with twice daily temperature recordings. CDFA staff continues to be onsite to monitor the situation.

April 18, 2018:  Two new confirmed cases. Two horses located in the quarantined barn at the Orange County premises have been confirmed for Equine Herpesvirus-1. A mare displayed a fever the morning of April 17,2018 and a horse which was febrile for one day on Sunday April 8th. Bothe horses have been placed in separate quarantine isolation stabling on the property. All exposed horses under quarantine continue to be monitored and have temperatures taken twice daily. The index Equine Herpesvirus Myeloencephalopathy case remains quarantined and isolated offsite and continues to show clinical improvements. CDFA staff continues to be onsite to monitor the situation.

April 16 2018: No new cases. To date there has only been the initial neurological horse that tested positive for the Equine Herpesvirus -1. This positive horse was removed from the premises to an offsite quarantine isolation facility on Thursday, April 12, 2018. The index premises in Orange County has one barn of 56 exposed horses under quarantine. The quarantined exposed horses are under strict biosecurity requirements and are having temperatures taken twice daily. Since the quarantine placement on Friday April 13, 2018, there have been no fevers reported. CDFA staff remain on site to monitor the situation.  

April 13, 2018: A 17 year old Thoroughbred gelding, originating from an Orange County facility, displaying neurologic signs has been confirmed positive for Equine Herpesvirus Myeloencephalopathy. The gelding has been isolated and placed under quarantine. Exposed horses will be monitored for clinical signs and temperatures will be taken twice daily. Any horse displaying a fever or compatible clinical signs will be tested. CDFA will continue to monitor the situation and post new information as it becomes available.